Device for detecting a sleeping state judging device, method of detecting a sleeping state judging method, and computer program product

A method of detecting a sleeping state of a subject, comprising:

• measuring an index which reflects brain activities and which indicates an extent of changes in an activity state of a brain of the subject during sleeping at every given unit time;
• and
• judging the sleeping state at a given time in a time window which covers one cycle of sleeping, based on the index which reflects the brain activities and which is measured at every given unit time within the time window, among the measured indexes which reflects the brain activities.

A computer program product having a computer readable medium including programmed instructions for performing a sleeping state detecting process according to which a sleeping state of a subject is judged, wherein the instructions, when executed by a computer, cause the computer to perform:

• measuring an index which reflects brain activities and which indicates an extent of changes in an activity state of a brain of the subject during sleeping at every given unit time;
• and
• judging the sleeping state at a given time in a time window which covers one cycle of sleeping, based on the index which reflects the brain activities and which is measured at every given unit time within the time window, among the measured indexes which reflects the brain activities.